package com.xohm.daemon;

import java.net.*;
import java.io.*;
import java.util.*;

/**
 * <B>This class helps to send POST HTTP requests with various form data,
 * including files. Cookies can be added to be included in the request.</B>
 */
public class ClientHttpRequest
{
	private URLConnection connection    = null;
	private OutputStream os             = null;
	private Map<String, String> cookies = new HashMap<String, String>();
	private static Random random        = new Random();
	private String boundary             = "---------------------------" + randomString()+ randomString() + randomString();

	protected void connect() throws IOException
	{
		if (os == null)
			os = connection.getOutputStream();
	}

	protected void write(char c) throws IOException
	{
		connect();
		os.write(c);
	}

	public void write(String s) throws IOException
	{
		connect();
		os.write(s.getBytes());
	}

	public void newline() throws IOException
	{
		connect();
		write("\r\n");
	}

	public void writeln(String s) throws IOException
	{
		connect();
		write(s);
		newline();
	}

	protected static String randomString()
	{
		return Long.toString(random.nextLong(), 36);
	}

	private void boundary() throws IOException {
		write("--");
		write(boundary);
	}

	/**
	 * Creates a new multipart POST HTTP request on a freshly opened URLConnection.<br><br>
	 *
	 * @param connection an already open URL connection
	 * @throws IOException
	 */
	public ClientHttpRequest(URLConnection connection) throws IOException
	{
		this.connection = connection;
		connection.setDoOutput(true);
		connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
	}

	/**
	 * Creates a new multipart POST HTTP request for a specified URL<br><br>
	 *
	 * @param url the URL to send request to
	 * @throws IOException
	 */
	public ClientHttpRequest(URL url) throws IOException
	{
		this(url.openConnection());
	}

	/**
	 * Creates a new multipart POST HTTP request for a specified URL string<br><br>
	 *
	 * @param urlString the string representation of the URL to send request to
	 * @throws IOException
	 */
	public ClientHttpRequest(String urlString) throws IOException
	{
		this(new URL(urlString));
	}

	/**
	 * adds a cookie to the requst<br><br>
	 * 
	 * @param name cookie name
	 * @param value cookie value
	 * @throws IOException
	 */
	public void setCookie(String name, String value) throws IOException
	{
		cookies.put(name, value);
	}

	/**
	 * adds cookies to the request<br><br>
	 * 
	 * @param cookies the cookie "name-to-value" map
	 * @throws IOException
	 */
	public void setCookies(Map<String, String> cookies) throws IOException
	{
		if (cookies == null)
			return;
		this.cookies.putAll(cookies);
	}

	/**
	 * adds cookies to the request<br><br>
	 * 
	 * @param cookies array of cookie names and values (cookies[2*i] is a name, cookies[2*i + 1] is a value)
	 * @throws IOException
	 */
	public void setCookies(String[] cookies) throws IOException
	{
		if (cookies != null)
		{
			for (int i = 0; i < cookies.length - 1; i += 2)
			{
				setCookie(cookies[i], cookies[i + 1]);
			}
		}
	}

	private void writeName(String name) throws IOException
	{
		newline();
		write("Content-Disposition: form-data; name=\"");
		write(name);
		write('"');
	}

	/**
	 * adds a string parameter to the request<br><br>
	 * 
	 * @param name parameter name
	 * @param value parameter value
	 * @throws IOException
	 */
	public void setParameter(String name, String value) throws IOException
	{
		boundary();
		writeName(name);
		newline();
		newline();
		writeln(value);
	}

	private static void pipe(InputStream in, OutputStream out) throws IOException
	{
		byte[] buf = new byte[500000];
		int nread;
		int total = 0;
		synchronized (in) {
			while ((nread = in.read(buf, 0, buf.length)) >= 0) {
				out.write(buf, 0, nread);
				total += nread;
			}
		}
		out.flush();
		buf = null;
	}

	/**
	 * adds a file parameter to the request<br><br>
	 * 
	 * @param name parameter name
	 * @param filename the name of the file
	 * @param is input stream to read the contents of the file from
	 * @throws IOException
	 */
	public void setParameter(String name, String filename, InputStream is) throws IOException
	{
		boundary();
		writeName(name);
		write("; filename=\"");
		write(filename);
		write('"');
		newline();
		write("Content-Type: ");
		String type = URLConnection.guessContentTypeFromName(filename);
		if (type == null)
			type = "application/octet-stream";
		writeln(type);
		newline();
		pipe(is, os);
		newline();
	}

	/**
	 * adds a file parameter to the request<br><br>
	 * 
	 * @param name parameter name
	 * @param file the file to upload
	 * @throws IOException
	 */
	public void setParameter(String name, File file) throws IOException
	{
		setParameter(name, file.getPath(), new FileInputStream(file));
	}

	/**
	 * adds a parameter to the request; if the parameter is a File, the file is uploaded,
	 * otherwise the string value of the parameter is passed in the request.<br><br>
	 * 
	 * @param name parameter name
	 * @param object parameter value, a File or anything else that can be stringified
	 * @throws IOException
	 */
	public void setParameter(String name, Object object) throws IOException
	{
		if (object instanceof File)
		{
			setParameter(name, (File) object);
		}
		else
		{
			setParameter(name, object.toString());
		}
	}

	/**
	 * adds parameters to the request<br><br>
	 * 
	 * @param parameters "name-to-value" map of parameters; if a value is a file, the file is uploaded, otherwise it is stringified and sent in the request
	 * @throws IOException
	 */
	public void setParameters(Map parameters) throws IOException
	{
		if (parameters != null)
		{
			for (Iterator i = parameters.entrySet().iterator(); i.hasNext();)
			{
				Map.Entry entry = (Map.Entry) i.next();
				setParameter(entry.getKey().toString(), entry.getValue());
			}
		}
	}

	/**
	 * adds parameters to the request<br><br>
	 * 
	 * @param parameters array of parameter names and values (parameters[2*i] is a name, parameters[2*i + 1] is a value); if a value is a file, the file is uploaded, otherwise it is stringified and sent in the request
	 * @throws IOException
	 */
	public void setParameters(Object[] parameters) throws IOException
	{
		if (parameters != null)
		{
			for (int i = 0; i < parameters.length - 1; i += 2)
			{
				setParameter(parameters[i].toString(), parameters[i + 1]);
			}
		}
	}

	/**
	 * posts the requests to the server, with all the cookies and parameters that were added.<br><br>
	 * 
	 * @return input stream with the server response
	 * @throws IOException
	 */
	public InputStream post() throws IOException
	{
		boundary();
		writeln("--");
		os.close();
		return connection.getInputStream();
	}

	/**
	 * posts the requests to the server, with all the cookies and parameters that were
	 * added before (if any), and with parameters that are passed in the argument.<br><br>
	 * 
	 * @param parameters request parameters
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setParameters
	 */
	public InputStream post(Map parameters) throws IOException
	{
		setParameters(parameters);
		return post();
	}

	/**
	 * posts the requests to the server, with all the cookies and parameters that
	 * were added before (if any), and with parameters that are passed in the argument.<br><br>
	 * 
	 * @param parameters request parameters
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setParameters
	 */
	public InputStream post(Object[] parameters) throws IOException
	{
		setParameters(parameters);
		return post();
	}

	/**
	 * posts the requests to the server, with all the cookies and parameters that were
	 * added before (if any), and with cookies and parameters that are passed in the arguments.<br><br>
	 * 
	 * @param cookies request cookies
	 * @param parameters request parameters
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setParameters
	 * @see setCookies
	 */
	public InputStream post(Map<String, String> cookies, Map parameters) throws IOException
	{
		setCookies(cookies);
		setParameters(parameters);
		return post();
	}

	/**
	 * posts the requests to the server, with all the cookies and parameters that were added
	 * before (if any), and with cookies and parameters that are passed in the arguments.<br><br>
	 * 
	 * @param cookies request cookies
	 * @param parameters request parameters
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setParameters
	 * @see setCookies
	 */
	public InputStream post(String[] cookies, Object[] parameters) throws IOException
	{
		setCookies(cookies);
		setParameters(parameters);
		return post();
	}

	/**
	 * post the POST request to the server, with the specified parameter.<br><br>
	 * 
	 * @param name parameter name
	 * @param value parameter value
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setParameter
	 */
	public InputStream post(String name, Object value) throws IOException
	{
		setParameter(name, value);
		return post();
	}

	/**
	 * post the POST request to the server, with the specified parameters.<br><br>
	 * 
	 * @param name1 first parameter name
	 * @param value1 first parameter value
	 * @param name2 second parameter name
	 * @param value2 second parameter value
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setParameter
	 */
	public InputStream post(String name1, Object value1, String name2, Object value2) throws IOException
	{
		setParameter(name1, value1);
		return post(name2, value2);
	}

	/**
	 * post the POST request to the server, with the specified parameters.<br><br>
	 * 
	 * @param name1 first parameter name
	 * @param value1 first parameter value
	 * @param name2 second parameter name
	 * @param value2 second parameter value
	 * @param name3 third parameter name
	 * @param value3 third parameter value
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setParameter
	 */
	public InputStream post(String name1, Object value1, String name2,
			Object value2, String name3, Object value3) throws IOException
	{
		setParameter(name1, value1);
		return post(name2, value2, name3, value3);
	}

	/**
	 * post the POST request to the server, with the specified parameters.<br><br>
	 * 
	 * @param name1 first parameter name
	 * @param value1 first parameter value
	 * @param name2 second parameter name
	 * @param value2 second parameter value
	 * @param name3 third parameter name
	 * @param value3 third parameter value
	 * @param name4 fourth parameter name
	 * @param value4 fourth parameter value
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setParameter
	 */
	public InputStream post(String name1, Object value1, String name2,
			Object value2, String name3, Object value3, String name4,
			Object value4) throws IOException
	{
		setParameter(name1, value1);
		return post(name2, value2, name3, value3, name4, value4);
	}

	/**
	 * posts a new request to specified URL, with parameters that are passed in the argument.<br><br>
	 * 
	 * @param parameters request parameters
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setParameters
	 */
	public static InputStream post(URL url, Map parameters) throws IOException
	{
		return new ClientHttpRequest(url).post(parameters);
	}

	/**
	 * posts a new request to specified URL, with parameters that are passed in the argument.<br><br>
	 * 
	 * @param parameters request parameters
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setParameters
	 */
	public static InputStream post(URL url, Object[] parameters) throws IOException
	{
		return new ClientHttpRequest(url).post(parameters);
	}

	/**
	 * posts a new request to specified URL, with cookies and parameters that are passed in
	 * the argument.<br><br>
	 * 
	 * @param cookies request cookies
	 * @param parameters request parameters
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setCookies
	 * @see setParameters
	 */
	public static InputStream post(URL url, Map<String, String> cookies, Map parameters) throws IOException
	{
		return new ClientHttpRequest(url).post(cookies, parameters);
	}

	/**
	 * posts a new request to specified URL, with cookies and parameters that are passed in
	 * the argument.<br><br>
	 * 
	 * @param cookies request cookies
	 * @param parameters request parameters
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setCookies
	 * @see setParameters
	 */
	public static InputStream post(URL url, String[] cookies,
			Object[] parameters) throws IOException
	{
		return new ClientHttpRequest(url).post(cookies, parameters);
	}

	/**
	 * post the POST request specified URL, with the specified parameter.<br><br>
	 * 
	 * @param name parameter name
	 * @param value parameter value
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setParameter
	 */
	public static InputStream post(URL url, String name1, Object value1) throws IOException
	{
		return new ClientHttpRequest(url).post(name1, value1);
	}

	/**
	 * post the POST request to specified URL, with the specified parameters.<br><br>
	 * 
	 * @param name1 first parameter name
	 * @param value1 first parameter value
	 * @param name2 second parameter name
	 * @param value2 second parameter value
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setParameter
	 */
	public static InputStream post(URL url, String name1, Object value1,
			String name2, Object value2) throws IOException
	{
		return new ClientHttpRequest(url).post(name1, value1, name2, value2);
	}

	/**
	 * post the POST request to specified URL, with the specified parameters.<br><br>
	 * 
	 * @param name1 first parameter name
	 * @param value1 first parameter value
	 * @param name2 second parameter name
	 * @param value2 second parameter value
	 * @param name3 third parameter name
	 * @param value3 third parameter value
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setParameter
	 */
	public static InputStream post(URL url, String name1, Object value1,
			String name2, Object value2, String name3, Object value3)
			throws IOException
	{
		return new ClientHttpRequest(url).post(name1, value1, name2, value2,
				name3, value3);
	}

	/**
	 * post the POST request to specified URL, with the specified parameters.<br><br>
	 * 
	 * @param name1 first parameter name
	 * @param value1 first parameter value
	 * @param name2 second parameter name
	 * @param value2 second parameter value
	 * @param name3 third parameter name
	 * @param value3 third parameter value
	 * @param name4 fourth parameter name
	 * @param value4 fourth parameter value
	 * @return input stream with the server response
	 * @throws IOException
	 * @see setParameter
	 */
	public static InputStream post(URL url, String name1, Object value1,
			String name2, Object value2, String name3, Object value3,
			String name4, Object value4) throws IOException
	{
		return new ClientHttpRequest(url).post(name1, value1, name2, value2,
				name3, value3, name4, value4);
	}
}
